I'm 48, and some days my knees ache, but I don't want an electric bike.

My back and knees no longer ache at the end of every day.

My knees were aching to the point that I was struggling to keep up with her.

His left knee ached as it had before surgery in college.

His right knee ached and he rubbed warmth into it.

For a long time he crept about, until his knees ached.

Fifteen minutes later, knees aching, they took off and flew home.

His knees and back ached from staying so long in the same position.

He went quickly over to the bed and sat down as though his knees ached.

As of twenty years after retirement, his knee still aches.